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| -rw-r--r-- | udev.8 | 64 |
1 files changed, 60 insertions, 4 deletions
@@ -1,11 +1,67 @@ -.TH UDEV 8 "October 2003" "" "Linux Programmer's Manual" +.TH UDEV 8 "October 2003" "" "Linux Administrator's Manual" .SH NAME -udev \- Linux dynamic device naming support +udev \- Linux configurable dynamic device naming support .SH SYNOPSIS .B udev .SH "DESCRIPTION" .B udev -is a wonderful program whose man page has not been written yet. +creates or removes device node files usually located in the /dev directory. +As part of the +.B hotplug +subsystem, +.B udev +is exectuted if a kernel device is added or removed from the system. +.P +On device creation, +.B udev +reads the sysfs directory of the given device, to collect device attributes +like label, serial number or bus device number. +These attributes are passed as a key to the namedev subsystem +to receive a unique name for device file creation. +namedev maintains a database for devices present on the system. +.P +On device removal, +.B udev +queries the namedev database for the name of the device file to delete. +.P +namedev expects its configuration at +.I /etc/udev/namedev.config. +The file consists of a set of lines. All empty lines and +lines beginning with a '#' will be ignored. +.br +Every line defines the mapping between device attributes and the name of +the device file. It starts with a keyword defining the method for +overriding the default kernel naming scheme, followed by a list +of keys and ends with the definition of the filename for the device. +.TP +.B LABEL +device label or serial number, like USB serial number, SCSI UUID or +file system label +.TP +.B NUMBER +device number on the bus, like PCI bus id +.TP +.B TOPOLOGY +device position on bus, like physical port of USB device +.TP +.B REPLACE +string replacement of the kernel device name +.P +If no matching configuration is found, the default kernel device name is used. +.SH "EXAMPLE" +.nf +# USB printer to be called lp_color +LABEL, BUS="usb", serial="W09090207101241330", NAME="lp_color" + +# sound card with PCI bus id 00:0b.0 to be called dsp +NUMBER, BUS="pci", id="00:0b.0", NAME="dsp" + +# USB mouse at third port of the second hub to be called mouse1 +TOPOLOGY, BUS="usb", place="2.3", NAME="mouse1" + +# ttyUSB1 should always be called pda +REPLACE, KERNEL="ttyUSB1", NAME="pda" +.fi .SH "FILES" .nf .ft B @@ -16,7 +72,7 @@ is a wonderful program whose man page has not been written yet. .fi .LP .SH "SEE ALSO" -.BR hotplug "(8)" +.B hotplug (8) .PP The .I http://linux-hotplug.sourceforge.net/ |